There is a little twist to that one. These Danish soldiers died during WWI fighting for Germany.
After the disastrous Second Schleswigan War in 1864, the duchies of Schleswig and Holstein, were ceded to what a few years later became a unified Germany.
That included a couple of hundred thousand ethnic Danes.
While Holstein was and is German, Schleswig, especially northern Schlesvig (what is today southern Jutland) was dominated by ethnic Danes who were now German citizens.
There was a hope that Schleswig or at least northern Schleswig would somehow be returned to Denmark or that the Danish minority would somehow gain autonomy within Germany. How realistic that hope was is difficult to say. It was IMO at best optimistic.
Anyway, being German citizens also included conscription to the German military - just as ethnic French from Alsace and Lorraine were supposed to.
WWI started and Germany mobilized and that included the ethnic Danes. There was some internal debate as to whether they should do their duty as German citizens and stand a better chance of reunification with Germany after the war or at least gain more political influence - or whether they should refuse and/or defect to Denmark.
It was generally decided to serve in German uniform (Many had also given up any hope of being unified with Denmark and others had become genuine German citizens.) So some 8.000 ethnic Danes served in the German military during WWI, of which some 3.500 were killed.
79 of those are today buried at the cemetery at Braine.
After the war DK was urged by the Allies to reclaim both Schleswig and Holstein - of course amputating Germany even more.
The Danish government declined. Denmark would have ended up with about a million ethnic Germans - a
very sizable minority! And there would no doubt be a lot of trouble had DK annexed both duchies. - In fact that decision probably saved northern Schleswig from being annexed back into Germany during WWII.
The solution was a referendum. People in Schleswig would simply vote on which country they wised to belong to. And as there was a majority of ethnic Danes in northern Schleswig, that went to Denmark. While southern Schleswig remained in Germany. - Of course on both sides of the border there are today German and Danish minorities. About 50.000 on each side IIRC.
Ironically the idea of a referendum was suggested around the time of the Schleswigan Wars, but the nationalists in Denmark wouldn't have it.
Had the referendum taken place back in the mid 1800s the border between DK and Germany would have been drawn almost exactly as it is today, apart from the German town of Flensburg having become Danish.
- Lives would have been spared and Denmark would not have suffered a national trauma that lasted some 130 years.
